Apparatus

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sensors Mode-S transponder

7821C7

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-227A · BOEING 737 MAX 8

Hex
7821C7
Octal
36020707
Decimal
7,872,967
Country
CN
Tail
B-227A
Type
B38M
No current signal · last broadcast Jul 26, 15:25 UTC
Flights observed
170
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:25 UTC

Last known position

Most recent position reported by Mode-S 7821C7.

Country allocation

The ICAO 24-bit address 7821C7 falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
CXA855 Xiamen Airlines 22 2026-07-22
CXA867 - 17 2026-06-27
CXA856 Xiamen Airlines 17 2026-07-23
CXA868 - 15 2026-06-27
CXA892 - 14 2026-07-13
CXA837 - 10 2026-06-26
CXA838 - 8 2026-06-26
CXA848 - 5 2026-06-23
CXA8716 Xiamen Airlines 4 2026-07-26
CXA851 - 4 2026-07-10
CXA847 - 4 2026-06-23
CXA8842 - 3 2026-07-21
CXA823 Xiamen Airlines 3 2026-07-24
CXA8032 - 3 2026-06-13
CXA898 Xiamen Airlines 2 2026-05-25
CXA897 Xiamen Airlines 2 2026-05-25
CXA8841 - 2 2026-07-21
CXA8683 Xiamen Airlines 2 2026-05-03
CXA866 Xiamen Airlines 2 2026-05-27
CXA865 Xiamen Airlines 2 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CXA8716 KUL → NKG Jul 26, 03:05 UTCJul 26, 15:25 UTC12h 21m
2026-07-25 CXA8716 KUL → NKG Jul 25, 06:10 UTCJul 25, 15:35 UTC9h 25m
2026-07-25 CXA8716 KUL → NKG Jul 25, 03:05 UTCJul 25, 03:15 UTC10m
2026-07-24 CXA823 XMN → KUL Jul 24, 12:50 UTCJul 24, 16:35 UTC3h 45m
2026-07-24 CXA8415 XMN → KMG Jul 24, 04:25 UTCJul 24, 10:55 UTC6h 30m
2026-07-23 CXA8325 FOC → CAN Jul 23, 08:30 UTCJul 23, 08:40 UTC10m
2026-07-23 CXA856 CGK → FOC Jul 23, 00:05 UTCJul 23, 01:35 UTC1h 30m
2026-07-22 CXA855 FOC → CGK Jul 22, 12:40 UTCJul 22, 15:30 UTC2h 50m
2026-07-21 CXA8842 - Jul 21, 11:35 UTCJul 21, 11:50 UTC15m
2026-07-21 CXA8841 - Jul 21, 09:30 UTCJul 21, 10:15 UTC45m
2026-07-21 - - Jul 21, 04:40 UTCJul 21, 05:00 UTC20m
2026-07-21 CXA856 CGK → FOC Jul 21, 00:15 UTCJul 21, 01:45 UTC1h 30m
2026-07-20 CXA855 FOC → CGK Jul 20, 17:45 UTCJul 20, 18:00 UTC15m
2026-07-20 CXA855 FOC → CGK Jul 20, 15:30 UTCJul 20, 16:20 UTC50m
2026-07-19 CXA856 CGK → FOC Jul 19, 04:55 UTCJul 19, 05:05 UTC10m
2026-07-19 CXA856 CGK → FOC Jul 19, 00:15 UTCJul 19, 01:45 UTC1h 30m
2026-07-18 CXA855 - Jul 18, 17:00 UTCJul 18, 17:20 UTC20m
2026-07-18 CXA855 - Jul 18, 12:30 UTCJul 18, 15:35 UTC3h 5m
2026-07-17 CXA856 CGK → FOC Jul 17, 04:35 UTCJul 17, 05:04 UTC30m
2026-07-17 CXA856 CGK → FOC Jul 17, 00:14 UTCJul 17, 01:45 UTC1h 30m
2026-07-16 CXA855 - Jul 16, 18:34 UTCJul 16, 18:50 UTC15m
2026-07-16 CXA855 - Jul 16, 16:35 UTCJul 16, 17:10 UTC35m
2026-07-13 CXA892 - Jul 13, 06:01 UTCJul 13, 21:55 UTC15h 55m
2026-07-12 CXA892 - Jul 12, 19:50 UTCJul 13, 19:30 UTC23h 40m
2026-07-12 CXA892 - Jul 12, 18:25 UTCJul 13, 13:50 UTC19h 25m
2026-07-12 CXA892 - Jul 12, 12:35 UTCJul 13, 08:30 UTC19h 55m
2026-07-11 CXA892 - Jul 11, 12:20 UTCJul 12, 06:25 UTC18h 5m
2026-07-10 CXA852 - Jul 10, 07:55 UTCJul 10, 08:15 UTC20m
2026-07-10 CXA851 - Jul 10, 03:25 UTCJul 10, 06:35 UTC3h 10m
2026-07-06 CXA8842 - Jul 6, 13:15 UTCJul 6, 13:25 UTC10m
2026-07-06 CXA856 - Jul 6, 00:55 UTCJul 6, 01:45 UTC50m
2026-07-06 CXA856 - Jul 6, 00:10 UTCJul 6, 00:25 UTC15m
2026-07-05 CXA855 - Jul 5, 16:45 UTCJul 5, 17:00 UTC15m
2026-07-05 CXA855 - Jul 5, 14:25 UTCJul 5, 15:10 UTC45m
2026-07-04 CXA855 - Jul 4, 16:05 UTCJul 5, 15:10 UTC23h 5m
2026-07-04 CXA8793 FOC → NNG Jul 4, 13:25 UTCJul 4, 16:20 UTC2h 55m
2026-06-27 CXA868 - Jun 27, 06:54 UTCJun 27, 08:29 UTC1h 35m
2026-06-27 CXA867 - Jun 27, 04:44 UTCJun 27, 04:59 UTC15m
2026-06-26 CXA838 - Jun 26, 17:04 UTCJun 27, 03:20 UTC10h 15m
2026-06-26 CXA837 - Jun 26, 15:10 UTCJun 26, 15:20 UTC10m
2026-06-26 CXA854 - Jun 26, 05:39 UTCJun 26, 13:45 UTC8h 5m
2026-06-26 CXA853 - Jun 26, 01:34 UTCJun 26, 03:54 UTC2h 20m
2026-06-25 CXA8705 - Jun 25, 09:25 UTCJun 25, 09:34 UTC10m
2026-06-25 CXA824 - Jun 25, 00:14 UTCJun 25, 06:40 UTC6h 25m
2026-06-24 CXA823 - Jun 24, 05:54 UTCJun 24, 19:00 UTC13h 5m
2026-06-23 CXA848 - Jun 23, 06:55 UTCJun 23, 07:25 UTC30m
2026-06-23 CXA847 - Jun 23, 04:45 UTCJun 23, 05:20 UTC35m
2026-06-22 CXA8380 - Jun 22, 04:19 UTCJun 22, 04:30 UTC10m
2026-06-21 CXA868 - Jun 21, 06:44 UTCJun 21, 11:05 UTC4h 20m
2026-06-21 CXA867 - Jun 21, 04:54 UTCJun 21, 05:10 UTC15m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the B-227A page for operator, model, and routing details .

Mode-S 7821C7 frequently asked

What is Mode-S code 7821C7?
7821C7 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-227A.
Where is Mode-S 7821C7 registered?
Mode-S code 7821C7 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821C7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821C7, octal 36020707, decimal 7,872,967.
What flights does 7821C7 operate?
Mode-S 7821C7 has broadcast 20 distinct callsigns, including CXA855, CXA867, CXA856, CXA868, CXA892.